Feature： Type: Office Chair Caster (No marking, No noise) Color: Black+Clear Material: Polyurethane layer & Nylon body Wheel Diameter: 3 inch (75mm) Installing height: 4-1/4inch (108mm) Stem Diameter: 7/16 inch (11mm) Stem Height: 7/8 inch (22mm) Feature: Twin Wheel Quantity: 5 Pack Description： 3-inch diameter twin wheel with soft roll rubber wheel surface, no marking on carpets or any kind of natural and engineered wood floor, tile floor, Laminate, Tile, Slate, and all other Hard Floors .
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